The group, which saw its shares hit last week following a surprise profit alert, has been operating in the country for more than six years through its local venture, PT Aggreko Indonesia, employing some 100 people in several locations.
It currently has around 210 megawatts of generating capacity operational and recently secured contracts in the mining and utility industries to the value of $10m. This includes work supporting the Sumatra Gold and Copper mine over a five-year period and providing six-month emergency power for Bintan Island.
The planned fleet investment will total $40m over the next three years, with Aggreko set to open a new depot within the Jakarta area. Equipment will come from the group’s manufacturing facility in Dumbarton.
Robert Wells, managing director for south-east Asia, said: “Aggreko continues to believe in the market opportunity that exists in Indonesia and supports all current and future employees in the country, as well as the people of Indonesia, as they develop their economy and power infrastructure.”
Prime Minister David Cameron, who is on a tour of south-east Asia, added: “Companies like Aggreko are leading the way in exporting their expertise from Glasgow to Jakarta – one of the fastest growing markets in the world.
“This £25m investment will make a huge difference to Indonesia’s growing energy needs.”
Aggreko was recently awarded contracts in the Philippines.